There will be 2 new additions to the HifiMan player line-up and they will be officially announced on Sept. 28th during the opening ceremony of the company's new experience store in China. Here are the picture on one of them:

Are these the response to DX50 / X3?

Update 9/24/13

The official name is HiFiMan 700. Judging from the name, this is very likely to replace the 6xx series.

More info: there are 5 hidden buttons on the lower panel (touch panel?). The 3.5mm stereo jack has TRRS balanced output, but compatible to normal TRS single end. (support to single end TRS not confirmed yet).

Update 9/26/13

The 2nd player is HM-802. For those who keep track on DAP news, we had seen this name being rumored to be HM-901's name. Now it is actually adapted as the new player name. No picture or any detail yet

The last reversion of the 60x series was released a couple of months ago, actually. I would guess one of the new player could likely be the replacement series.

Are you referring to the HM-601LE? As I understand it's the same except for the amplification section of the HM-602 that's been swapped in the HM-601LE. I'm curious why Head-direct never carried the HM-603 variants. I liked that it has 10-13 battery life according to the published specs, but in my experience battery life with the HifiMan daps were usually 2 hrs short of specs.

Are you referring to the HM-601LE? As I understand it's the same except for the amplification section of the HM-602 that's been swapped in the HM-601LE. I'm curious why Head-direct never carried the HM-603 variants. I liked that it has 10-13 battery life according to the published specs, but in my experience battery life with the HifiMan daps were usually 2 hrs short of specs.

Yes, the LE will be the last of the 60x series. That what HifiMan announced during its release.

Anyway, more update: some early report said the TRRS balanced out will have built-in TRS comparability, but now some early impression points out it might not ( will require an adapter in that case). Well, not sure which is real at this point. The same impression also points out it is on the same level of SQ as the current HM6xx.